एपीए उद्धरण

(1995). Earth changes through time. Macmillian/McGraw-Hill school pub.

शिकागो स्टाइल उद्धरण

Earth Changes Through Time. Macmillian/McGraw-Hill school pub, 1995.

एमएलए उद्धरण

Earth Changes Through Time. Macmillian/McGraw-Hill school pub, 1995.